Fix readme (#58)

* Fix readme

* Fix readme

README.md

@@ -1,51 +1,193 @@
-<!-- Begin Title, generated by Fern  -->
 # Cohere Go Library
 
 ![](banner.png)
 
-
 [![fern shield](https://img.shields.io/badge/%F0%9F%8C%BF-SDK%20generated%20by%20Fern-brightgreen)](https://github.com/fern-api/fern)
+[![go shield](https://img.shields.io/badge/go-docs-blue)](https://pkg.go.dev/github.com/cohere-ai/cohere-go)
 
 The Cohere Go library provides convenient access to the Cohere API from Go.
-<!-- End Title  -->
 
 ## ✨🪩✨ Announcing Cohere's new Go SDK ✨🪩✨
 
 We are very excited to publish this brand new Go SDK. We now officially support Go and will continuously update this library with all of the latest features in our API. Please create issues where you have feedback so that we can continue to improve the developer experience!
 
-## Documentation
+## Requirements
 
-Cohere documentation and API reference is available [here](https://docs.cohere.com/).
+This module requires Go version >= 1.18.
 
-<!-- Begin Installation, generated by Fern  -->
-# Installation
+## Installation
 
 Run the following command to use the Cohere Go library in your module:
 ```sh
 go get github.com/cohere-ai/cohere-go
 ```
-<!-- End Installation  -->
 
-<!-- Begin Usage, generated by Fern  -->
-# Usage
+## Usage
+
+```go
+import cohereclient "github.com/cohere-ai/cohere-go/client"
+
+client := cohereclient.NewClient(cohereclient.WithToken("<YOUR_AUTH_TOKEN>"))
+```
+
+## Chat
+
+```go
+import (
+  cohere       "github.com/cohere-ai/cohere-go"
+  cohereclient "github.com/cohere-ai/cohere-go/client"
+)
+
+client := cohereclient.NewClient(cohereclient.WithToken("<YOUR_AUTH_TOKEN>"))
+response, err := client.Chat(
+  context.TODO(),
+  &cohere.ChatRequest{
+    Message: "How is the weather today?",
+  },
+)
+```
+
+## Timeouts
+
+Setting a timeout for each individual request is as simple as using the standard
+`context` library. Setting a one second timeout for an individual API call looks
+like the following:
+
+```go
+ctx, cancel := context.WithTimeout(context.TODO(), time.Second)
+defer cancel()
+
+response, err := client.Chat(
+  context.TODO(),
+  &cohere.ChatRequest{
+    Message: "How is the weather today?",
+  },
+)
+```
+
+## Client Options
+
+A variety of client options are included to adapt the behavior of the library, which includes
+configuring authorization tokens to be sent on every request, or providing your own instrumented
+`*http.Client`. Both of these options are shown below:
+
+```go
+client := cohereclient.NewClient(
+  cohereclient.WithToken("<YOUR_AUTH_TOKEN>"),
+  cohereclient.WithHTTPClient(
+    &http.Client{
+      Timeout: 5 * time.Second,
+    },
+  ),
+)
+```
+
+> Providing your own `*http.Client` is recommended. Otherwise, the `http.DefaultClient` will be used,
+> and your client will wait indefinitely for a response (unless the per-request, context-based timeout
+> is used).
+
+## Errors
+
+Structured error types are returned from API calls that return non-success status codes. For example,
+you can check if the error was due to a bad request (i.e. status code 400) with the following:
+
+```go
+response, err := client.Generate(
+  context.TODO(),
+  &cohere.GenerateRequest{
+    Prompt: "invalid prompt",
+  },
+)
+if err != nil {
+  if badRequestErr, ok := err.(*cohere.BadRequestError);
+    // Do something with the bad request ...
+  }
+  return err
+}
+```
+
+These errors are also compatible with the `errors.Is` and `errors.As` APIs, so you can access the error
+like so:
+
+```go
+response, err := client.Generate(
+  context.TODO(),
+  &cohere.GenerateRequest{
+    Prompt: "invalid prompt",
+  },
+)
+if err != nil {
+  var badRequestErr *cohere.BadRequestError
+  if errors.As(err, badRequestErr) {
+    // Do something with the bad request ...
+  }
+  return err
+}
+```
+
+If you'd like to wrap the errors with additional information and still retain the ability to access the type
+with `errors.Is` and `errors.As`, you can use the `%w` directive:
 
 ```go
-import coheregoclient "github.com/cohere-ai/cohere-go/client"
+response, err := client.Generate(
+  context.TODO(),
+  &cohere.GenerateRequest{
+    Prompt: "invalid prompt",
+  },
+)
+if err != nil {
+  return fmt.Errorf("failed to generate response: %w", err)
+}
+```
+
+## Streaming
 
-client := coheregoclient.NewClient(coheregoclient.WithToken("<YOUR_AUTH_TOKEN>"))
+Calling any of Cohere's streaming APIs is easy. Simply create a new stream type and read
+each message returned from the server until it's done:
+
+```go
+stream, err := client.ChatStream(
+  context.TODO(),
+  &cohere.ChatStreamRequest{
+    Message: "Please write a short story about the weather today.",
+  },
+)
+if err != nil {
+  return nil, err
+}
+
+// Make sure to close the stream when you're done reading.
+// This is easily handled with defer.
+defer stream.Close()
+
+for {
+  message, err := stream.Recv()
+  if errors.Is(err, io.EOF) {
+    // An io.EOF error means the server is done sending messages
+    // and should be treated as a success.
+    break
+  }
+  if err != nil {
+    // The stream has encountered a non-recoverable error. Propagate the
+    // error by simply returning the error like usual.
+    return nil, err
+  }
+  // Do something with the message!
+}
 ```
-<!-- End Usage  -->
 
-<!-- Begin Status, generated by Fern  -->
-# Beta Status
+In summary, callers of the stream API use `stream.Recv()` to receive a new
+message from the stream. The stream is complete when the `io.EOF` error is
+returned, and if a non-`io.EOF` error is returned, it should be treated just
+like any other non-`nil` error.
+
+## Beta Status
 
 This SDK is in beta, and there may be breaking changes between versions without a major 
 version update. Therefore, we recommend pinning the package version to a specific version. 
 This way, you can install the same version each time without breaking changes.
-<!-- End Status  -->
 
-<!-- Begin Contributing, generated by Fern  -->
-# Contributing
+## Contributing
 
 While we value open-source contributions to this SDK, this library is generated programmatically. 
 Additions made directly to this library would have to be moved over to our generation code, 
@@ -54,5 +196,3 @@ otherwise they would be overwritten upon the next generated release. Feel free t
 an issue first to discuss with us!
 
 On the other hand, contributions to the README are always very welcome!
-<!-- End Contributing  -->
-